<?php return array (
  0 => 
  array (
    'username' => '小明',
    'content' => '去吃饭',
  ),
  1 => 
  array (
    'username' => '小红',
    'content' => '吃饭去了',
  ),
  2 => 
  array (
    'username' => '小王',
    'content' => '老王去哪里了',
  ),
)?>